Improvement in harrows



Y UNITED I STATES .PATENT OFFICE.

. WILLIAM FRANK, o F MoUND-sTATIoN, ILLINOIS.

lmpovEMEm-'IN HARRows.

'Specification forming part of Letters Patent No. li9,798, dated November 9, 1875; application filed l September 23, 1875.

To all whom it 'mayconcerm Be it known that I, WILLIAM FRANK, of Mound Station, in the county of Brown and State of Illinois, have invented a new and Im proved H arrow; and I do hereby declare'that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming a part of this specicatiom'in which- Figure l is a plan view of the sectional harrow; Fig. 2, a side elevation of one of the secl tions, with the draft attachment in section;

Fig. 3, detail of the link and loop of draft attachment 5 Fig. 4, detail of the section-coupling; Fig. 5, detail modification of brace-eye; Fig. 6, detail of framebar B; Fig. 7, detail showing attachment of teeth.

This invention relates to certain improve ments in harrows; audit consists in three equt lateral-triangular frames, constituting `a sec` tional harrow, in which theparts are capable of use either singly r collectively. The invention also consists inI the peculiar construction of the draft attachment, and the means for coupling the sections together, as hereinafter more fully described.

In the drawing, A A A represent the three equilateral-triangular sections of the harrow, which are each symmetrical in construction.

Said sections are composed of frame-bars B,

each of which is identical with the lother in,

length, lateral dimension, out of joints, arrangement of couplings, and teeth-holding devices. By means of this construction it will be seen that each section is a perfect equilateral triangle, which adapts the sections to be used collectively to form alarge equilateral barrow, in which the draft attachment may be shifted from one corner to the other, so that when the teeth become wornon one side, instead of taking them all out, the draft attach ment -is simply changed, to one of the other angles, the equilateral yconstruction permitting a perfect draft from either corner; The

, sections may also be separately and independently shifted in the same Way, and may bereciprocally changed, ifdesired. The bars B being exactly alike, the cost of manufacturing is greatly reduced, for but a single pattern need be used to form the whole frame, and any one of the bars may ber readily replaced by afnewone without special measurement or delay.

C are the couplings, which detachably 4 `fasten the sections together. Said couplings consist of open links a, which are inserted` in the brace-eyes D, and prevented from becoming accidentally detachedby means of blocks b and pins c, the said blocks confining the eyes to the end of thelinks, so that they can never come out, and the pins placed iuclinedly upon opposite sides. of the links, to prevent the lateral displacement of the blocks. Said brace-eyes D consist each of a rod passed through the ends ofthe bars B, and bent around to form eyes for the lcouplings C ou each side, the said device forming at once a brace for the ends of the bars B, and eyes on each side for the reciprocally-interchangeable sections. The said brace-eyes may be located inside the junction of the bars, as in Fig. l; or

they may be placed outside the same, as in Fig. 5, in which event they form in the angle a draft attachment at d, which takes the place ofthe separate bolt andeye ein Fig. 1.

- E are the teeth of the barrow, which may be of any shape, and are secured to the frame B by means of vertical grooves f, in the frame and eyes g, with screw-threaded `stern and nuts h, upon the inside, by means of which the Shanks ofthe teeth are drawn into the grooves, Vwhich latter serve to hold 'sitioin them stiftly in po- The part of theharrow used as the front is provided with4 a specially-constructed draft attachment, which consistsof a link, i, pivoted loopj, and wedge-block It, with an underneath cavity or hole to receive the end of the front barrow tooth. Said draft attachment, like the ,other parts of the harrow, is detachable, so that it can be applied to any corner ofthe barrow. When it is to be transferred the link Aand loop are thrown backward, the fro'nt end of the Wedge elevated until the top of the front tooth is out of the ho1e,when the ,wedge may be withdrawn .and the loop and link taken off by being turned horizontally, so as to pass over the divergent ends of the bars.

This form of draft attachment, While being detachable, is a very secureione,`for the greater the strain the stronger the devices are held together.

Iam aware of the fact Ythat it is not new to construct harrows in a triangular form, and that they have also been grouped together to fornir ai sectional barrow; but heretofore one angle has been made sharper than the other, which prevents the reversi ble,-detachable, and reci procall'y-i nterchan geable use displayed in my invention, in which the equilatera-l construction secures the above-described advantages, and the construction of the entire frame is simply a reduplicaitin of one of the bars B. Having thus described myinvention, what I claim 'as new is;- l'

1. Abarrow composed of detachablel equilateral-triangular sections, which are adapted tafbe used, either singly or' collectively, and

with either corner for the front, as and for the A.

hole, the-divergent ends of the bars B', and the front tooth, vcombined and arranged-as shown and described..

open links a, blocks b,'a.nd pins c, combined and arrangedas shown and described. f-

The above specification .ofA my invention signed by me this 21st day of September,4 187 5.

. "Witnesses:

SoLoN C. KEMo'N,

CEAS. A, vPETTI'JJ. A

3. The sectioncouplings consisting ofthe 

